CVE-2023-39960 : What You Need to Know
Discover the impact of CVE-2023-39960 on Nextcloud Server, how attackers can exploit the WebDAV endpoint, affected versions, and steps to secure your systems.
Nextcloud Server has improper restriction of excessive authentication attempts on the WebDAV endpoint, potentially allowing attackers to brute force passwords. Find out more about this security vulnerability and how to protect your systems.
Understanding CVE-2023-39960
Nextcloud Server vulnerability with CVE-2023-39960 allows attackers to perform brute force attacks on the WebDAV API, impacting versions 22.0.0 to 26.0.4.
What is CVE-2023-39960?
CVE-2023-39960 highlights an improper restriction of excessive authentication attempts in the Nextcloud Server, enabling attackers to guess passwords through brute force attacks.
The Impact of CVE-2023-39960
The vulnerability affects Nextcloud Server versions 22.0.0 to 26.0.4, potentially leading to unauthorized access to sensitive data stored on the Nextcloud platform.
Technical Details of CVE-2023-39960
Learn more about the vulnerability specifics, affected systems, and exploitation techniques.
Vulnerability Description
Nextcloud Server versions prior to 25.0.9 and 26.0.4, and Nextcloud Enterprise Server versions prior to 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, and 26.0.4 lack proper protection mechanisms, allowing attackers to perform brute force attacks on WebDAV.
Affected Systems and Versions
The affected systems include Nextcloud Server versions 22.0.0 to 26.0.4 and Nextcloud Enterprise Server versions 22.0.0 to 26.0.4.
Exploitation Mechanism
Attackers can exploit this vulnerability by repeatedly trying different passwords through the WebDAV API until the correct one is found, potentially gaining unauthorized access.
Mitigation and Prevention
Discover the immediate steps to secure your Nextcloud Server and prevent future exploitation.
Immediate Steps to Take
Users are advised to update to Nextcloud Server version 25.0.9 or 26.0.4, and Nextcloud Enterprise Server version 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, or 26.0.4 to apply the necessary patches.
Long-Term Security Practices
Implement strong password policies, enable multi-factor authentication, and regularly update your Nextcloud Server to protect against similar vulnerabilities.
Patching and Updates
Stay informed about security updates released by Nextcloud and apply patches promptly to mitigate the risk of exploitation.